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Why does gravitational potential energy have a negative value?

The negative value stems from the definition of gravitiational potential energy which states that it is equal to the work done by the gravitational field moving a body to its given position from infinity. At...
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Answered by Kush P. • Physics tutor
4979 Views

3/5 of a number is 162. Work out the number.

If we call the unknown number 'x' we can put it in to an equation to work it out as we known 5/3 of the number is 162.5x/3 = 162then times each side of the equals symbol by 5 to get (3x/5) 5 = 162 35which is...
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Answered by Lucy M. • Maths tutor
14222 Views

what is a catalyst

A substance that increases the rate of a reaction without having been used up itself in the reaction. They function by providing a lower activation energy for the reaction to begin, which is a type of thresh...
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Answered by Samuel C. • Chemistry tutor
2501 Views

What is the difference between glucose and glycogen?

Glucose is a monosaccharide, meaning that it is composed of single units. This is suitable for transport through the blood stream. Glycogen, however is a polysaccharide meaning that is composed of at least m...
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Answered by Samuel C. • Biology tutor
10116 Views

Assess to what extent China can claim to be a superpower

China is a BRIC, or emerging, country and is challenging the USA for superpower status1) Economically low cost labour - cheap manufacturing costs - can outpace US companieslarge volume of exports - US relies...
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Answered by Rebecca S. • Geography tutor
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